Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Sep. 29, 2012	Oct. 01, 2011
Impact on the Company's results of operations of recording stock-based compensation
Stock-based compensation cost	$ 12.6	$ 11.5
Stock-based compensation capitalized to inventory	1.9
Cost of sales
Impact on the Company's results of operations of recording stock-based compensation
Stock-based compensation cost	2.2	1.8
Research and development
Impact on the Company's results of operations of recording stock-based compensation
Stock-based compensation cost	2.9	2.6
Selling, general and administrative
Impact on the Company's results of operations of recording stock-based compensation
Stock-based compensation cost	7.5	7.1
Full Value Awards - Total
Impact on the Company's results of operations of recording stock-based compensation
Unrecognized stock-based compensation	99.2
Estimated amortization period	2 years 6 months
Exercise price (in dollars per share)	$ 0.00
Full Value Awards - Total \| Minimum
Impact on the Company's results of operations of recording stock-based compensation
Vesting period	1 year
Full Value Awards - Total \| Maximum
Impact on the Company's results of operations of recording stock-based compensation
Vesting period	4 years
Restricted Stock Units with Market Conditions (MSU)
Impact on the Company's results of operations of recording stock-based compensation
Vesting period	3 years
Granted (in shares)	658,000	511,240
Aggregate grant-date fair value	9.8	9.0
Restricted Stock Units with Time-based Conditions
Impact on the Company's results of operations of recording stock-based compensation
Vesting period	3 years
Granted (in shares)	4,700,000	3,600,000
Aggregate grant-date fair value per share	$ 11.83	$ 12.41
Percentage of first tranche vested	33.00%
Initial vesting period	1 year
Subsequent vesting period	2 years
Restricted Stock Units
Impact on the Company's results of operations of recording stock-based compensation
Granted (in shares)	5,400,000	4,100,000
Stock Option Plans
Impact on the Company's results of operations of recording stock-based compensation
Unrecognized stock-based compensation	4.4
Estimated amortization period	1 year 4 months 24 days
Stock Option Plans \| Minimum
Impact on the Company's results of operations of recording stock-based compensation
Vesting period	3 years
Stock awards expiration period	5 years
Stock Option Plans \| Maximum
Impact on the Company's results of operations of recording stock-based compensation
Vesting period	4 years
Stock awards expiration period	10 years
1998 Employee Stock Purchase Plan
Impact on the Company's results of operations of recording stock-based compensation
Unrecognized stock-based compensation	$ 0.6
Look-back period	6 months

The exercise price of Full Value Awards.

No definition available.

Name:	jdsu_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsFullValueAwardsExercisePrice
Namespace Prefix:	jdsu_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The total fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

No definition available.

+ Details

Name:	jdsu_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue
Namespace Prefix:	jdsu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The total fair value per share as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

No definition available.

+ Details

Name:	jdsu_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValuePerShare
Namespace Prefix:	jdsu_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of first tranche vested.

+ References

No definition available.

+ Details

Name:	jdsu_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPercentageOfSharesVested
Namespace Prefix:	jdsu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the initial period of time over which the first tranche of an employee's equity award is vested, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

No definition available.

+ Details

Name:	jdsu_ShareBasedCompensationArrangementByShareBasedPaymentAwardInitialAwardVestingPeriod
Namespace Prefix:	jdsu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The time period (in months) for the provision of the plan that allows the employee to take advantage of a look-back period whereby the employee has the benefit of using the price at the beginning of the offering period in the event that the stock price increases during the offering period.

+ References

No definition available.

+ Details

Name:	jdsu_ShareBasedCompensationArrangementByShareBasedPaymentAwardLookBackPeriodSubsequentTo2006Modification
Namespace Prefix:	jdsu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the subsequent period of time over which the remaining tranches of an employee's equity award are vested, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

No definition available.

+ Details

Name:	jdsu_ShareBasedCompensationArrangementByShareBasedPaymentAwardSubsequentAwardVestingPeriod
Namespace Prefix:	jdsu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The date when the equity-based award expires as specified in the award agreements, which may be presented in a variety of ways.

+ References

No definition available.

+ Details

Name:	jdsu_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardExpirationDating
Namespace Prefix:	jdsu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ShareBasedCompensationAllocationAndClassificationInFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration